Katniss + Kate Bishop + OTA
Katniss had a bad feeling about Kate going off on her own. It didn't make any sense, especially given the fact that they hadn't seen anything out of place during their whole watch, but there was just this ... feeling.
A few minutes after Kate left, Katniss began walking the same way the other woman had left and soon stumbled upon her talking to a blonde woman. Everything looked somewhat normal until the blonde began rushing towards Kate. Instinctively, Katniss pulled an arrow and sooner than she could think, released it.
As it flew towards its intended target, on course to take the blonde out, Kate took that opportune time to make her own move. Katniss watched her pull an arrow and shoot the possessed woman, stepping to the side as she did -- right in the path of Katniss' arrow.
Horrified, she watched both women crumple to the ground. She stood frozen, the urge to rush forward and check on them very compelling, but she knew it was no use. Both arrows had made contact and done their job. There were no survivors.